Manufacture of hinges



o. L ANZR Manufacture of Hinges.

No. 231,590. Patented Aug. 24 1880:

.- b. u -36h ATTORNEYS.

UNITED STATES PATENT OFFICE.

CHARLES LANZ, OF' PITTSBURG, PENNSYLVANIA.

MANUFACTURE OF HINGES.

SPECIFICATION forming part of Letters Patent No. 231,590, dated August 24, 1880. Application filed February 15, 1879.

To all whom it may concern:

Be it known that I, CHARLES LANZ, of Pittsburg, in the county of Allegheny and State of Pennsylvania, have invented a new and useful ImprovementinGonstructingHinges; andldo hereby declare that the following is a full and exact description thereof, reference being had tothe aocompanyingdrawings, and to the letters of reference marked thereon.

My invention relates to a new and useful improvement in the method of constructing the pintle part of a hinge; and the invention consists in upsetting one end of the shank through the medium of a pair of dies, and forming the contour and bearing for the strap portion of the hinge, and securing the strap to the pintle through the medium of a swaging-die, h, combined with a pintle-holder, g, whereby the pintle B is secured in the shank A at right angles to the axis of it, all as will be hereinafter fully described.

To enable others skilled in the art to make and use my invention, I will proceed to describe its construction and operation.

In the accompanying drawings, which form part of my specification, Figure 1 represents a blank cut from a round bar of iron for the shank of the hinge. "Fig. 2 is a similar blank forthe pintle portion of thehinge. Fig.3represents the blank for the shank upset with the blank for the pintle arranged in juxtaposition with the bulb on the shank prior to the bulbbeing driven over the end of the pintle. Fig. 4 represents the finished article. Fig. 5isa horizontal section of the dies used for upsetting the blank shown in Fig. 1. Fig. 6 is a vertical section of the dies used for driving the bulb over the pintle and giving to the bulb the desired contour and proper bearing for the strap portion of the hinge.

In the drawings, A represents the shank of the pintle portion of the hinge; B, the pintle. The blank represented in Fig. 1 is heated and placed in gripingdies O D, the heated end of the blank projecting sufficiently to form the metal in the bulb. The upsetting-die 0 then strikes upon the end of the blank and upsets it, forming a bulb,f, as represented in Fig. 3.

The pintle B is placed in a die, g, and the bulb f, while in a heated condition. is placed over the upper end of the pintle B, as indicated in Fig. 3, the die It being forced down upon the bulb and its shank. The bulb f is forced over the end of the pintle B, and the desired contour given to the bulb and a suitable bearing for the strap portion of the hinge. It is then removed from the (lies, and the bulb in the operation of cooling shrinks firmly around the pintle, and thereby secures it in a permanent and fixed position in the shank portion of the hinge.

The dies hereinbefore referred to are placed in and operated by suitable machinery.

The above-described invention is an in provement upon a former patent granted to me and numbered 184,249.

I am aware that two pieces of metal have been dovetailed together to formabolt, screw, spike, or rivet by forcing the shank into and expanding the end of the same within the head, and hence do not wish to be understood as claiming, broadly, any such process or method.

What I do claim is- The hereinbefore-described method of constructing the pintle part of a l1inge-viz., upsetting one end of the shank through the medium of a pair of dies, and forming the contour and bearing for the strap portiou of the hinge, and securing the shank to the pintle through the medium of a swaging-die, h, combined with apintle-holder, 9, whereby the pintle B is secured in the shank A at right angles to its axis, as specified.

CHARLES LANZ. Witnesses A. G. JOHNSTON, JAMES J. J onnsron. 

